public static void SetSecurityTokenServicePrefs(Credentials creds) { Amazon.IdentityManagement.AmazonIdentityManagementServiceClient client = new Amazon.IdentityManagement.AmazonIdentityManagementServiceClient(creds); var setResult = client.SetSecurityTokenServicePreferencesAsync(new Amazon.IdentityManagement.Model.SetSecurityTokenServicePreferencesRequest { GlobalEndpointTokenVersion = GlobalEndpointTokenVersion.V2Token }).Result; if (setResult.HttpStatusCode != System.Net.HttpStatusCode.OK) { throw new Exception(); } }